Contents
What is showAsAction in Android?
android:showAsAction Keyword. When and how this item should appear as an action item in the app bar. A menu item can appear as an action item only when the activity includes an app bar.
What is the purpose of sub menu?
A sub-menu is a derivative menu that is reliant on a top-level menu in a graphical user interface system. Common software environments such as Microsoft Windows have more or less trained users to be able to recognize controls for accessing sub-menus, which are often invisible from a start screen.
